JP2012215761A5

JP2012215761A5 -

Info

Publication number: JP2012215761A5
Application number: JP2011081773A
Authority: JP
Filing date: 2011-04-01
Publication date: 2014-04-17
Anticipated expiration: 2031-04-01

Description

次に、タイミングｔ５〜ｔ８の期間において、液晶表示部３０では、最上部から最下部に向かって線順次走査が行われ、補間フレーム画像Ｆｉの表示が再度行われる（図５（Ａ））。すなわち、この例では、タイミングｔ４〜ｔ８の期間において、補間フレーム画像Ｆｉの表示が２回繰り返される。そして、液晶表示部３０において液晶素子ＬＣの応答がほぼ終了した後のタイミングｔ６〜ｔ７の期間において、バックライト駆動部１７は、バックライト４０が、表示光量演算部１６により求められた表示光量Ｂに応じた輝度Ｉｉで発光するように駆動する（図５（Ｂ）〜（Ｄ））。具体的には、バックライト４０は、表示光量Ｂが大きいほど高い輝度Ｉｉで発光する。 Next, in the period of timing t5 to t8, the liquid crystal display unit 30 performs line sequential scanning from the uppermost part to the lowermost part, and the interpolation frame image Fi is displayed again (FIG. 5A). That is, in this example, the display of the interpolated frame image Fi is repeated twice during the period from the timing t4 to t8. In the period from timing t6 to t7 after the response of the liquid crystal element LC is almost finished in the liquid crystal display unit 30, the backlight drive unit 17 has the display light amount B calculated by the display light amount calculation unit 16. It is driven so as to emit light with the luminance Ii according to (FIGS. 5B to 5D). Specifically, the backlight 40 emits light with higher luminance Ii as the display light quantity B increases.

図７は、表示光量Ｂが変化したときのバックライト４０の輝度の変化を表すものであり、（Ａ）は表示光量Ｂを示し、（Ｂ）はバックライト４０の輝度Ｉ，Ｉｉを示す。この例は、表示光量Ｂが、１００％から５０％に変化する場合を示している。すなわち、図７は、バックライト４０の輝度が、図５（Ｂ）の状態から図５（Ｃ）の状態に変化する場合を示している。表示光量Ｂが１００％の時には、バックライト駆動部１７は、バックライト４０の輝度Ｉ，Ｉｉが同じになるように、バックライト４０を駆動する。そして、タイミングｔ１０において、表示光量Ｂが５０％に変化した後（図７（Ａ））、バックライト駆動部４０は、輝度Ｉが徐々に増加し、輝度Ｉｉが徐々に減少するように、バックライト４０を駆動する（図７（Ｂ））。すなわち、バックライト駆動部１７は、この表示光量Ｂの変化に応じて、すぐに輝度Ｉ，Ｉｉが変化しないように制御する。この、輝度Ｉ，Ｉｉが最終値になるまでの時間（時定数）は、例えば１秒程度に設定することが可能である。これにより、輝度Ｉ，Ｉｉが急激に変化することがないため、観察者が表示画像を不自然に感じるおそれを低減することができる。 FIG. 7 shows changes in the luminance of the backlight 40 when the display light quantity B changes. (A) shows the display light quantity B, and (B) shows the luminances I and Ii of the backlight 40. In this example, the display light amount B is changed from 100% to 50%. That is, FIG. 7 shows a case where the luminance of the backlight 40 changes from the state of FIG. 5B to the state of FIG. When the display light quantity B is 100%, the backlight drive unit 17 drives the backlight 40 so that the luminances I and Ii of the backlight 40 are the same. Then, at timing t10, after the display light amount B has changed to 50% (FIG. 7A), the backlight drive unit 40 causes the backlight I to gradually increase and the luminance Ii to gradually decrease. The light 40 is driven (FIG. 7B). That is, the backlight drive unit 17 performs control so that the luminances I and Ii do not change immediately according to the change in the display light amount B. The time (time constant) until the luminances I and Ii become final values can be set to about 1 second, for example. Thereby, since the brightness | luminances I and Ii do not change rapidly, a possibility that an observer may feel a display image unnatural can be reduced.

（１０）前記バックライト制御部は、
前記環境光量が増加した場合には、前記第１の発光量を増加させるとともに、前記第２の発光量を減少させ、
前記環境光量が減少した場合には、前記第１の発光量を減少させるとともに、前記第２の発光量を増加させる
前記（９）に記載の表示装置。 (10) The backlight control unit
When the environmental light amount increases, the first light emission amount is increased and the second light emission amount is decreased,
The display device according to (9), wherein when the environmental light amount decreases, the first light emission amount is decreased and the second light emission amount is increased .

Claims

A liquid crystal display unit that displays a series of original frame images and a series of interpolated frame images generated based on the series of original frame images in a time-sharing manner;
A backlight that emits light intermittently;
The first light emission amount of the backlight in the first period corresponding to the display period of the original frame image, and the second light emission amount of the backlight in the second period corresponding to the display period of the interpolated frame image. And a backlight control unit that controls the display independently.

Based on each original frame image, provided with a calculation unit for obtaining a display light amount that will be emitted from the display surface when the original frame image is displayed on the liquid crystal display unit,
The display device according to claim 1, wherein the backlight control unit controls the first light emission amount and the second light emission amount based on a calculation result of the calculation unit.

The backlight control unit
When the display light amount increases, the first light emission amount is decreased and the second light emission amount is increased,
The display device according to claim 2, wherein when the amount of display light decreases, the first light emission amount is increased and the second light emission amount is decreased.

The backlight control unit gradually changes the first light emission amount and the second light emission amount over a plurality of frame periods, respectively.
The display device according to any one of claims 1 to 3 .

The display device according to claim 1 , wherein the backlight control unit controls the sum of the first light emission amount and the second light emission amount to be constant.

The display device according to claim 1, wherein the first light emission amount is the same as or larger than the second light emission amount.

The display device according to any one of claims 1 to 6 , wherein the backlight control unit controls the first light emission amount and the second light emission amount based on light emission luminance of the backlight.

The backlight control unit, the first light emission amount and the second light emission amount, the first of claims 1 to 7 for controlling each by the length of the length and the second period of time The display device according to any one of the above.

An ambient light sensor unit for detecting the ambient light amount of light around the display device;
The backlight control unit based on the detection result of the ambient light sensor portion, according to claims 1 to control the first light emission amount and the second amount of light emission in any one of claims 8 Display device.

The backlight control unit
When the environmental light amount increases, the first light emission amount is increased and the second light emission amount is decreased,
The display device according to claim 9, wherein when the amount of environmental light decreases, the first light emission amount is decreased and the second light emission amount is increased .

The backlight has a plurality of partial light emitting portions,
The display device according to any one of claims 1 to 10 , wherein the backlight control unit controls the first light emission amount and the second light emission amount independently for each partial light emitting unit. .

The display device according to any one of claims 1 to 11, further comprising an interpolation image generation unit configured to generate the series of interpolation frame images based on the series of original frame images.

A display unit that displays a series of original frame images and a series of interpolated frame images generated based on the series of original frame images in a time-sharing manner;
The light emission amount of the display unit in the display period of the original frame image is a first total light emission amount obtained by adding the first offset light emission amount to the first basic light emission amount corresponding to the image information of the original frame image. The display unit is controlled as described above, and the light emission amount of the display unit in the display period of the interpolation frame image is set to the second basic light emission amount corresponding to the image information of the interpolation frame image. A display control unit for controlling the display unit so as to achieve the added second total light emission amount,
The display control unit independently controls the first offset light emission amount and the second offset light emission amount.

A series of original frame images and a series of interpolated frame images generated based on the series of original frame images are displayed in a time-sharing manner on the liquid crystal display unit,
A first light emission amount of the backlight in a first period corresponding to the display period of the original frame image, and a second light emission amount of the backlight in a second period corresponding to the display period of the interpolated frame image; A display method that controls the display independently and intermittently emits backlight.